Electric lamp



(No Model.) 3 Shlaets-Sheet 1. J. OLMSTED.

ELECTRIC LAMP.

No. 252,396. A) Patented Jan:17.1882.

FlEm

JWITTNEEEEE: INVENTUH:

M En r (Z%44A:A ya/MM g 9 (Ro Iodel.) 3 Sheets-8heet 2.

J. OLMS'I'ED.

ELECTRIC LAMP. No. 252,396. Patented Jan. 17,1882.

'F'HIS.

WITNESSES: INVENTDR: amw/gg MAW! yrl/a m/ add 071%?- (No Model.) 3Sheets-Sheet 3.

J. OLMSTED.

ELECTRIC LAMP.

No. 252,396. Fm Patented Jan.17,1882.

I JNVENTUR:

WWgg- UNITED STATES PATENT OFFICE.

JOSEPH OLMSTED, OF NEW YORK, N. Y., ASSIGNOR TO THE UNITED STATESELEOTRIU LIGHTING COMPANY, HF SAME PLACE.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 252,396, dated January17, 1882. Application filed July 20, 1881. (No model.)

To all whom it may concern:

, Be it known that I, JOSEPH OLMSTED, a

citizen of the United States, residing at New York, in the county andState of New York, have invented certain new and useful Improvements inElectric Lamps,of .which the following is a specification, referencebeing had to the drawings accompanying and forming a part of the same.

My invention relates to electric-arc lamps or light-regulators.

The object of the invention is mainly to provide for a steady and slowdescent of the upper or gravit atin g carbon-carrier when released forthe purpose of bringing the pencils together to compeusatefor waste orconsumption, and at the same time to provide for a proper relativeadjustment of the two carbons atall times when the lamp is in operation,whereby a constant and steady light of maximum intensity maybemaintainrd. The means for efiectin g these objects involve theemployment of the usual electro-magnets, helices, or their equivalents,a movable armature, and a combined. clutch and retarding device to l eused in conjunction therewith, and arrang Li to retain or release thecarbon-carrier at as h times as may be necessary for the successfuloperation of the lamp. These devices are.

illustrated in the accompanying drawings,

in which- Figure 1 is an interior view of the feed mechanism complete-Fig. 2, a plan of the same; Fig. 3, a side e evation ot' the magnets and5 pivoted armature-lever; Fig. 4, a side view, in detail, of thefeed-controlling mechanism Fig. 5, a plan of thesame, and Fig. 6 anenlarged view of a pinion and devices connected therewiththat form aportion of the regulating o mechanism.

Similar letters of reference indicate corresponding parts in all thefigures.

The magnets of the lamps arelettered A and B. The former is included inthe main cir- 5 cuit--that is to say, the circuit which includes theelectrodes. The latter, in a shunt of high resistance around thelamp-lock of the aforesaid magnets,has its armature d d, attached to theends of a lever, D, pivoted to the vertical 5o sides of asupporting-frame, LL, and branched at its middle portion to permit thepassage through it of the carbon-carrier R.

O is a Y-shaped frame, composed of two parts,

0 c, Fig. 5, which are clamped together by screws 0 e and a screw-10d,f. The precise 5 shape and character of this frame may be altered inmanyways to suit the circumstances under which itmay be used. Thenrostconvenient fozm, however, of which 1 am awnreisthat shown.

B is a spindle passing through the branched sides of the frame (3 andextending beyond the same on either side, as shown in Figs. 2am] 5.

E is apinion of peculiar construction, tixed to spindle H, and F is agear-Wheel of considerabie diameter, also fixed to one of the ends ofthespindle H and without thrfrnme. in the end of the frame 0 is jourualed asecond shaft carrying a fun or equivalent retarding device, whichreceives motion from the wheel F by a 7e pinion, g, fixed to thepr-jecting end of its shaft.

The sides of the frame L L! are cut away or notched, as shown at l inFig. 6, and in these notches the ends of spindle H are cans-d to rest,and a link or cord with an adjusting screw, I, employed as a means ofconnection with the armatured, or that end of the lever D to which saidarmature is attached. The frame C being thus sustained at two pointsthatis to say, by the projrcting ends of spindle H, which.rests in notchesl, and the flexible connection with the armature d'-will be free toassume various positions corre ponding to changes in the position of thelever D.

The carbon-carrier R is provided with a projecting rack. Its position isin the fork of the frame U, and in a position to engage. with the pinionE. This latter is shown in detail in Fig.6, and consists of a spool withsides or flanges ff, in which are set a number of bars,

6, that take the place of the usual teeth. The width of the flange issuch as to embrace the smooth portion of the rack-bar and at the sametimeprcvent the rack from binding or press- 5 ing against the teethforming the pinion proper. 'As above stated, the rack-bar is situatedbetween the flanges of the pinion and the forkof frame 0, which forms aseat for it. When, therefore, the rack-bar and frame are placed at [00right angles, the former may be moved through the frame, causing thepinion to revolve as it moves. Should the frame be tilted, however, therack-bar is rendered incapable of further movement. by being griped andheld by the tiangesf on one side and the fork of the frame on the other.Upon this mainly depends the action ot'the lamp.

1 would here state that a spring, S, is employ ed, usually in connectionwith the lever I), to regulate the attractive effect of the magnets asmay be desired, and also thata dash-pot or similar device may be usedfor precluding the too sudden movement of the parts. The remainingfeatures of adjustment, stops for lintiting the motion of the lever l),and other details of construction I have not described, as they arecommon in many latnps, and are now well understood.

Theoperation of the lamp is as follows: Supposing the current to bedirected through the lamp. the main magnet, by its superior attraction,draws up the armaturelever d and tilts the frame (J until the pinionbinds the rack bar, upon which this latter is raised and the are formed.As the carbons are consumed the diversion of current; or increasingresistance imparts to lever D a. tendency to resume its normal position.By this means the frame 0 and the rack-bar are lowered until the spindle[:l rests on the notched sides of frame L L", whereupon a furtherlowering of armature d releases the rack-bar R, which descends, itsmovement being limited by the train of wheels and the fan, as above setforth. As soon as the carbons have approached a suiticient distance theincreasing attraction of magnet A locks the rack-bar. It may be statedthat the operation offeeding is effected by almost imperceptible steps,so that the moving parts may be said to have an exceedingly slow butpractically continuous motion.

The principle of theoperation of the lamp just described combines theadvantages of a rach-and-pinion as well as a clutch lamp. It will beseen that the tendency common to the clutch-lamp olthe carbonsfallinginto contact when released is entirely avoided,and also thattheleast motion of the pinion or the frame carrying the same may effectthe requisite amount of feed when the arc has increased beyond apredetermined point.

The form of lamp shown and described embodies the most approvedarrangement of the several parts necessary to the successful open ationof thelamp with which I am now familiar, I do not wish to be understood,however, as confining myself to this precise form, as the inventionembraces many possible modifications. For instance, the character of thepinion may be greatly changed and equivalent forms used therefor. Again,the character of the magnets may be varied, as well as that of the trainconnected with the pinion-shaft.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The combination, in an electric lamp, of a divided or branched plateor frame controlled by one or more -electro magnets, a pinion, and oneor more gear-wheels carried thereby, and a rack-bar'in gear with saidpinion and passing between it and the frame, so as to be locked orreleased by thetilting of the said frame, substantially as hereinbet'oreset forth.

2. The combination, in an electric lamp, of frame 0, pinion E, havingteeth 0 and pr0jections or flanges f, rack-bar R, engaging with thepinion, a train of gears for limiting the rotation of the pinion, andone or more electromagnets operating to move the frame for the purposeof looking or releasing the said rackbar, substantially as hereinbet'oreset forth.

3. The pinion E, having teeth eand flanges ff, in combination with arack-bar and electro magnetic detent mechanism, as and for the purposeset forth.

4. The combination of one or more electromagnets, A B, lever D, andarma-tures attached thereto with frame U, adjustably connected thereto,pinion E, having flangesf, rackbar R, and atrain of gears carried byframe 0 and operating to limit the rotation of the pinion, as and forthe purpose set forth.

In testimony whereof I have hereunto set: 5

my hand this 5th day of July, 188i.

JOSEPH OLMSTED. Witnesses:

W. H. CALHOUN, J l., W. W. (JQNKLIN,

